Quizs - The Newton's Third Law

Give an example of action and reaction forces in real life.

• When you push a wall, the wall pushes back on you with an equal force in the opposite direction.

• When you jump, the ground pushes you up with a force equal to your weight.

• When you throw a ball, the ball pushes back on your hand with an equal force.

• When you sit on a chair, the chair pushes up against you with a force equal to your weight.

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If a rocket pushes exhaust with a force of 10,000 N, the force acting on the rocket is 10,000 N in the opposite direction.

• 10,000 N in the same direction

• 5,000 N in the opposite direction

• 10,000 N in the opposite direction

• 15,000 N in the same direction

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Exert

• To cause an effect or influence something

• To relax or take it easy

• To ignore or neglect

• To observe without participating

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A rocket's force

• Lực đẩy của tên lửa là một ví dụ điển hình về định lý III Newton, với lực phản tác dụng là khí thải bị đẩy ra.

• Lực đẩy của tên lửa phụ thuộc vào trọng lực của Trái Đất.

• Lực đẩy của tên lửa không liên quan đến định luật Newton.

• Lực đẩy của tên lửa chỉ hoạt động trong không gian ngoài Trái Đất.

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What is meant by "action and reaction forces"?

• Two forces that are equal in size and opposite in direction, always appearing in pairs.

• Forces that act on different objects and do not affect each other.

• Forces that are always in the same direction and vary in size.

• Forces that can exist independently without any interaction.

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Example of action-reaction in walking

• The force you exert on the ground while walking is the action force, and the ground exerts an equal and opposite force back on you as the reaction force.

• The force of gravity pulling you down is the action force, and your legs pushing against the ground is the reaction force.

• The friction between your shoes and the ground is the action force, and the ground pushing you forward is the reaction force.

• The air resistance you feel while walking is the action force, and the ground pushing you up is the reaction force.

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State the formula for Newton's Third Law.

• F action = F reaction

• F action = 0

• F action = −F reaction

• F action + F reaction = 0

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What is Newton's Third Law of Motion?

• For every action, there is an equal and opposite reaction.

• An object in motion stays in motion unless acted upon by an external force.

• The acceleration of an object is directly proportional to the net force acting on it.

• The force of gravity is proportional to the mass of the objects involved.

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Lực tác dụng

• Action force.

• Reaction force.

• Frictional force.

• Gravitational force.

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Phản lực

• Reaction force.

• Force of action.

• Inertia force.

• Centrifugal force.

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